Improvement in steam-generators



CHRISTOPHER AHRENsAND FRANK KAMMAN, or CINCINNATI, oHIo.

IMPROVEM ENT IN STEAM-GENERTO RS.

Specification forming part of Letters Patent No. 111,298, dated January 31, 1871.

To all whom t may concern:

Be it known that we, GHRIsToPHER AHRENs and FRANK KAMMAN, of Cincinnati, Hamilton county, State of Ohio, have invented certain new and useful Improvements in Steam-Gen erat-ors; and we do hereby declare the following to be a sufliciently full, clear, and exact description thereof to enable oneA skilled in the art to which our invention appertains to make and use it, reference beinghad to the accompanying drawing, making a part of this specification.

Nature and Objects of Intention.

Our invention relates to the boiler patented by A B. Letta, June 6, Ylaaiend April 10,1855, designedspeciallyfor steam iire-engines,having continuous pipes in sections, (in the fire-chamber,) through which the water is forcibly circulated, being received from and discharged into a water-jacket, exposed inside to the fire; and our invention consists in a certain method of separating` into sections and so disposing the pipes that they can be placed within a circular water-jacket and yet give continuous pipes of equal length in each section.

Our invent-ion further consists in a simple device by which the presence or absence of water in the discharge ends of the coils of pipe may be determined at any time, this device being designed to dispense with exterior overiiow-pipes hitherto necessary in this class of boiler.

Description 0f the Accompanying Drawing.

Figure l is a sectional perspective view, eX- hibiting the interior of our improved boiler, with the chimney removed. Fig. 2 is a plan, showing the disposition of the pipes at the top of the boiler, and the device for determining the state of overflow of the 'coils or sections. Fig. Bis a plan of the under side of the boiler, showing the entry of feed-water to the sections, andn the manner of separating the feed equally between four sections and disposing ofthe pipes within the circle.

General Description.

A and B represent, respectively, the outer and linner circular shells of the water-jacket, -uuited at the top and bottom by the rings (l. D represents the grate, which may be of any approved construction. The shell A B C is surmounted by the customary cover and chimney, which must be easily detachable from the shell, in order that the pipes may be conveniently exposed for repairs. The jacket is supplied With water from an ordinary boiler-feeder or force-pump through pipe E. The water is carried in the jacket np to apoint a little above where the coil commences, the remainder of the space in the jacket being reserved for steam. The coils of pipes which occupy the interior of the jacket receive the necessary supply of water in the same way as the Latta boilers, before'- referred to-that is, by means of a circulating-pump, which draws Water from the jacket, forces it at any speed desired through the coils, and discharges it again into the jacket in the form of steam or highlyheated water.

F is the pipe leading from the circulatingpump.

For the purpose of dividing the coil into four separatelyremovable vertical sections, the entire distribution of the pipes of which will occupy a circle, we split at a with a T-tting, provided internally with a knife-edged ,splitter. This serves to give each haltl of the circle half the water-supply. The supply-pipe for each half is again similarly divided by the forked ttings at Gr, the branches g of which feeding two continuous coils of two vertical rows each, H H' and I I', which are discharged at J J Each of the branches g supplies three vertical rows, K K K and L L L, of continuous coils, which are discharged at M M. The four branches g g g g ltherefore feed four distinct sections, either of which, by unscrewing the right-and-left hand pipe-connections at the extreme ends, and detaching its suporting-bars N, can be removed for repairs. The arrangement of pipes, also, into two sections ot' two vertical rows each and two sections of three vertical rows each not only enables us to fill the circle, but provides for an equal length of pipe for each section, which is a very important consideration in this class of boilers, as it prevents the-water going through one or more sections only, and leaving the others without water. The discharge ends J J M M are tted steam-tight to the shell B, and

discharge water or steam from the coil directly t ycets P, for the purpose of into the jacket. Directly opposite the disl charge-apertures of these pipes we fit the fandetermining whether water is issuing,` from each section of the coil, or steam, and if steam, of what temperature, judging by the color, as the water or vaporv will shoot across the space between the shells A B and through the faucets P, if the latter are open. This simple device dispenses with the diving exterior pipes with gage cocks, hitherto used in the Latta boiler.

The pipes It and the pipes J J M M may either connect with the supply-pipe and jacket by right-andlefthand screws or by unioncouplings.

Either device will permit the removal of the sections bodily for repairs, when the bars N, to which the return-bends of the coil are se` cured for support, are disconnected at top andv bottom from the inner jacket, B. i

Claims.

jacket AB, the arrangement of the circulating coil of ,pipes into separately-detachable and separately-operating vsections by means of fittings a and G, each section having vertical rows of continuous pipes H H' I I K K K L L L, varying in number of rows to conform to the circle, as described, and for the purpose specified.

2. In combination with the water and steam jacketA B, extending up to a point above the discharge ends of the coil, the gage-cocks P,

CHRISTOPHER AHRENS. ERANK KAMMAN.

Witnesses;

FRANK MILLWARD, J- L- WAMMANN.- 

